Kommande patch 2.2.0.

Wrath of the Wastes 2 pieces: [Rend deals 400% increased damage.]
Wrath of the Wastes 4 pieces: [Rend lasts 400% longer.]
Wrath of the Wastes 6 pieces: [Whirlwind deals 400% increased damage to enemies affected by your Rend.]
Delsere's Magnum Opus 2 pieces: [Casting Arcane Orb, Energy Twister, Magic Missile or Shock Pulse reduces the cooldown of Slow Time by 1 |4second:seconds;.]
Delsere's Magnum Opus 4 pieces: [Enemies affected by your Slow Time take 1250% weapon damage every second.]
Delsere's Magnum Opus 6 pieces: [Enemies affected by your Slow Time take 500% more damage from your Arcane Orb, Energy Twister, Magic Missile and Shock Pulse abilities.]
Unhallowed Essence 2 pieces: [Your generators also generate 1 Discipline.]
Unhallowed Essence 4 pieces: [Gain 40% damage reduction for 4 seconds if no enemy is within 10 yards of you.]
Unhallowed Essence 6 pieces: [Your generators and Multishot deal 10% increased damage for every point of Discipline you have.]
Roland's Legacy 2 pieces: [Every use of Shield Bash and Sweep Attack reduces the cooldowns of your Laws and Defensive Skills by 1 second.]
Roland's Legacy 4 pieces: [Increase the damage of Shield Bash and Sweep Attack by 500%.]
Raiment of a Thousand Storms 2 pieces: [Your Spirit Generators have 25% increased attack speed and 500% increased damage.]
Raiment of a Thousand Storms 4 pieces: [Increases the weapon damage of Dashing Strike to 5000%.]
Raiment of a Thousand Storms 6 pieces: [Dashing Strike spends 50 Spirit, but refunds a Charge when it does.]
Guardian's Jeopardy 2 pieces: [+250 Vitality] [Regenerates 8000 Life per Second] UP FROM 2000
Zunimassa's Haunt 6 pieces: [Enemies hit by your Mana spenders take 100% more damage from your pets for 4 seconds.]
Inna's Mantra 6 pieces: [Mystic Ally casts Cyclone Strike, Exploding Palm, Lashing Tail Kick, Seven-Sided Strike, and Wave of Light when you do.]
Inna's Mantra 2 pieces: [Increase the passive effect of your Mystic Ally and the base passive effect of your Mantra by 100%.]
Tal Rasha's Elements 2 pieces: [Damaging enemies with Arcane, Cold, Fire or Lightning will cause a Meteor of the same damage type to fall from the sky. There is an 8 second cooldown for each damage type.]
Tal Rasha's Elements 4 pieces: [Attacks increase your resistance to that damage type by 100% for 6 seconds.]
Tal Rasha's Elements 6 pieces: [Attacks increase your damage by 75% for 3 seconds. Arcane, Cold, Fire, and Lightning attacks each add one stack. Adding a stack refreshes the duration.]
Immortal King's Call 2 pieces: [Call of the Ancients last until they die.]
Immortal King's Call 4 pieces: [Call of the Ancients' melee attacks also deal 600% weapon damage in a 15 yard radius.]
Immortal King's Call 6 pieces: [Increase the duration of your Wrath of the Berserker by [0.5|1|] |4second:seconds; every time an Ancient deals damage.]
Natalya's Vengeance 4 pieces: [The cooldown of Rain of Vengeance is reduced by 2 seconds every time you cast a primary skill and by 3 seconds every time you cast a Hatred spender.]
Natalya's Vengeance 6 pieces: [Rain of Vengeance deals 800% increased damage.]
New Legendary and Possible Set Strings
Disclaimer: Item Passives are usually put on Rings for the sake of testing - chances are these will be put on other gear/armor slots for the final version.
Warning: also bear in mind we cannot tell as of now which of these are "revamped set bonuses", and any of these affixes/strings could be part of those!!!
Some pre-existing affixes that are already items have been re-added with a new ID. This might mean their values are getting buffed, or they are being brought back for this Patch (from beta).

ItemPassivePowerDescriptions
Barbarian
P2_ItemPassive_Unique_025 - Enemies hit by your Furious Charge take [VALUE]% weapon damage over 3 seconds.
P2_ItemPassive_Unique_026 - The first enemy hit by Furious Charge takes [VALUE]% additional damage.
P2_ItemPassive_Unique_027 - Increase the duration of your Wrath of the Berserker by [VALUE] seconds every time an Ancient deals damage.
P2_ItemPassive_Unique_032 - Wrath of the Berserker gains the effect of every rune.
P2_ItemPassive_Unique_043 - Ground Stomp causes an Avalanche.
P2_ItemPassive_Unique_048 - Call of the Ancients' melee attacks also deal [VALUE% weapon damage in a 15 yard radius.
P2_ItemPassive_Unique_004 - Increase the damage of Whirlwind by [VALUE]% weapon damage.
P2_ItemPassive_Unique_001 - Rend lasts [VALUE]% longer.
P2_ItemPassive_Unique_002 - Rend deals [VALUE]% increased damage.
P2_ItemPassive_Unique_003 - Whirlwind deals [VALUE]% increased damage to enemies affected by your Rend.
Wizard
P2_ItemPassive_Unique_028 - Attacks increase your damage by [VALUE]% for 3 seconds. Arcane, Cold, Fire, and Lightning attacks each add one stack. Adding a stack refreshes the duration.
ItemPassive_Unique_914_x1 - [VALUE]% chance on being hit to release a Frost Nova.
P2_ItemPassive_Unique_037 - Increase the damage of Meteor by 100%. When your Meteor hits 3 or less enemies, the damage is increased by [VALUE]%.
P2_ItemPassive_Unique_013 - Casting Arcane Orb, Energy Twister, Magic Missile or Shock Pulse reduces the cooldown of Slow Time by [VALUE] seconds.
P2_ItemPassive_Unique_015 - Slow Time gains the effect of every rune.
P2_ItemPassive_Unique_012 - Enemies affected by your Slow Time take [VALUE]% more damage from your Arcane Orb, Energy Twister, Magic Missile and Shock Pulse abilities.
P2_ItemPassive_Unique_010 - Enemies affected by your Slow Time take [VALUE]% weapon damage every second.
P2_ItemPassive_Unique_050 - Your Fire Signature Spells cause up to 3 enemies to explode, dealing [VALUE]% weapon damage as Fire to enemies within 10 yards.
Monk
P2_ItemPassive_Unique_029 - Mystic Ally casts Cyclone Strike, Exploding Palm, Lashing Tail Kick, Seven-Sided Strike, and Wave of Light when you do.
P2_ItemPassive_Unique_033 - Increases the weapon damage of Dashing Strike to [VALUE]%.
ItemPassive_Unique_915_x1 - Seven-Sided Strike performs an additional seven strikes.
P2_ItemPassive_Unique_034 - Your Spirit Generators reduce your damage taken by [VALUE]% for 3 seconds.
P2_ItemPassive_Unique_049 - Increase the passive effect of your Mystic Ally and the base passive effect of your Mantra by [{VALUE1}*100]%.
P2_ItemPassive_Unique_022 - Your Spirit Generators have 25% increased attack speed and [VALUE]% increased damage.
ItemPassive_Unique_541_x1 - Your Spirit Generators generate [VALUE]% more Spirit.
P2_ItemPassive_Unique_021 - Dashing Strike spends [VALUE] Spirit, but refunds a Charge when it does.
Witch Doctor
P2_ItemPassive_Unique_030 - Enemies hit by your Mana spenders take [VALUE]% more damage from your pets for 4 seconds.
P2_ItemPassive_Unique_035 - Summon a Fetish Sycophant when you hit with a Mana spender.
P2_ItemPassive_Unique_041 - Gargantuan instead summons three smaller gargantuans each more powerful than before.
Crusader
P2_ItemPassive_Unique_039 - Increase the damage of Shield Bash and Sweep Attack by [VALUE]%.
P2_ItemPassive_Unique_040 - Every use of Shield Bash and Sweep Attack reduces the cooldowns of your Laws and Defensive Skills by 1 second.
P2_ItemPassive_Unique_042 - When your Shield Bash hits 3 or less enemies, its damage is increased by [VALUE]% and 50% of its Wrath Cost is refunded.
P2_ItemPassive_Unique_045 - Justice spawns a Blessed Hammer when it hits an enemy.
P2_ItemPassive_Unique_046 - Slash attacks in all directions.
P2_ItemPassive_Unique_047 - Blocks release forward a Fires of Heaven.
Demon Hunter
P2_ItemPassive_Unique_031 - Rain of Vengeance deals [VALUE]% increased damage.
P2_ItemPassive_Unique_005 - Your generators and Multishot deal [VALUE]% increased damage for every point of Discipline you have.
P2_ItemPassive_Unique_007 - Your generators also generate [VALUE] Discipline.
P2_ItemPassive_Unique_017 - Multishot hits enemies below [VALUE]% health twice.
P2_ItemPassive_Unique_020 - Gain [VALUE]% damage reduction for 4 seconds if no enemy is within 10 yards of you.
Misc
ItemPassive_Unique_916_x1 - Chance on kill to raise a skeleton to fight for you. Upon accumulating 5 skeletons, they explode for 300% weapon damage and the sword transforms into Ashbringer for a short time. Attacking with Ashbringer burns your target for [VALUE]% weapon damage as Holy.
P2_ItemPassive_Unique_036 - Attacks increase your resistance to that damage type by [VALUE]% for 6 seconds.
ItemPassive_Unique_917_x1 - Grants a [VALUE]% chance to block attacks. Blocked attacks inflict 20% less damage. After blocking an attack, your next attack inflicts 20% additional damage.
ItemPassive_Unique_918_x1 - Attacking enemies below [VALUE]% Life freezes them for 3 seconds.
ItemPassive_Unique_919_x1 - Your skill cooldowns are reduced by [VALUE] seconds.
ItemPassive_Unique_920_x1 - Reduce the remaining cooldown of one of your skills by [VALUE] seconds each time you spend resource.
ItemPassive_Unique_921_x1 - Summons a Fallen Lunatic to your side every [VALUE] seconds.
ItemPassive_Unique_922_x1 - Chance to create an area of focused power on killing a monster. Damage is increased by [VALUE]% while standing in the area.
ItemPassive_Unique_923_x1 - After 5 consecutive non-critical hits, your chance to critically hit is increased to 100% for [VALUE] seconds.
P2_ItemPassive_Unique_038 - Gain [VALUE] increased damage to a single element for 5 seconds. This effect rotates through the elements available to your class in the following order: Arcane, Cold, Fire, Holy, Lightning, Physical, Poison.
ItemPassive_Unique_Axe_1H_005_p2 - [VALUE]% chance to Smite enemies for 1500-1800% weapon damage as Lightning when you hit them.
ItemPassive_Unique_Belt_016_p2 - Picking up a Health Globe increases your maximum Life by [VALUE]% for 30 seconds, stacking up to 5 times.
ItemPassive_Unique_643_p2 - Blocks have a chance of summoning a charging wolf that deals [VALUE]% weapon damage to all enemies it passes through.
ItemPassive_Unique_597_p2 - After falling below [VALUE]% Life, all attacks are guaranteed Critical Hits for 4 seconds.
ItemPassive_Unique_Gem_018U_x1 - Enemies you attack also take increased damage from allied players, followers, and pets.
ItemPassive_Unique_Gem_019_x1 - Gain [VALUE]% melee damage reduction.
ItemPassive_Unique_Gem_019U_x1 - While below [VALUE]% Life, you may move unhindered through enemies.
ItemPassive_Unique_Gem_020_x1 - Your overhealing from Life per Hit and Life per Second are applied as an absorb shield for up to [VALUE]% of your maximum Life.
ItemPassive_Unique_Gem_021_x1 - Your cold skills now apply chill effects and your chill effects now slow enemy movement by an additional [VALUE]%.
ItemPassive_Unique_Gem_021U_x1 - Gain [VALUE]% increased chance to critically strike chilled and frozen enemies.
P2_Legendary_Potion_07 - Restores [VALUE]% resource when used below 50% health. (up from 25% - change to Potion of Rejuvenation)